Radiation protection dosimetry最新文献

{"title":"Assessment of spatial-average absorbed power density and peak temperature rise in skin model under localized eletromagnetic exposure.","authors":"Jiawen Zheng, Yu Zhang, Yinliang Diao, Dan Shi","doi":"10.1093/rpd/ncaf096","DOIUrl":"10.1093/rpd/ncaf096","url":null,"abstract":"<p><p>Numerical dosimetry for assessments of the absorbed power density (APD) and temperature rise has been conducted using multi-layer skin models, incorporating skin, fat, muscle, and other components, providing a scientific foundation for setting exposure limits. However, the influence of the vasculature on dosimetry outcomes remains underexplored. In this study, we developed a synthetic blood vessel model and integrated it into multi-layer skin models. Electromagnetic computations were performed, followed by steady-state temperature rise evaluations using the Pennes bioheat transfer equation across a frequency range of 3 to 30 GHz. To quantify the effect of vascular modeling on dosimetry results, simulations incorporating vasculature with varying endpoint diameters were compared to those without vasculature. Results showed that the effect of vascular modeling on peak spatial-averaged APD was negligible, and its influence on peak temperature rise was ~8% at 3 GHz, decreasing to less than <3% above 6 GHz. And the effect of the endpoint diameter is marginal. These variations are smaller than those previously reported due to changes in tissue thickness and dielectric or thermal properties. While the effect on peak temperature rise is modest, including vasculature helps refine localized thermal distributions and may inform future improvements in anatomical modeling.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1090-1102"},"PeriodicalIF":0.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144859559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiation dose to the eye lens and the shielding efficacy of a protective eye mask in patients with Hodgkin lymphoma undergoing repeated CT examinations.","authors":"Do-Byung Rhee, Jin-Seok Yeo, Hyo-Gi Kim, Il-Hwan Bae, Hee-June Kim","doi":"10.1093/rpd/ncaf092","DOIUrl":"10.1093/rpd/ncaf092","url":null,"abstract":"<p><p>This study evaluated radiation dose to the eye lens and the shielding efficacy of a radiation-protective eye mask (E-Mask) during repeated chest and abdomen computed tomography (CT) scans. Dose measurements were obtained using an anthropomorphic phantom and an optically stimulated luminescence dosemeter (Model TOPAZ, LANDAUER, USA). A 5-y follow-up scenario for Hodgkin lymphoma was simulated by assuming one scan per quarter, with the single-scan dose multiplied by 20 to represent four scans annually over 5-y. Despite the use of low-dose protocols based on national diagnostic reference levels issued by the Korea Disease Control and Prevention Agency, unshielded cumulative lens doses reached 363.89 mSv (right) and 424.84 mSv (left). Using an E-Mask reduced these doses to 243.96 mSv and 240.13 mSv, corresponding to reductions of 32.96% and 43.48%, respectively. These findings support the use of the E-Mask in radiosensitive populations to reduce lens exposure during long-term CT follow-up.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1081-1089"},"PeriodicalIF":0.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144837487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Small-field measurements in 3D polymer gel dosimetry using optical computed tomography.","authors":"","doi":"10.1093/rpd/ncaf112","DOIUrl":"10.1093/rpd/ncaf112","url":null,"abstract":"","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1131"},"PeriodicalIF":0.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145016092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of 50 Hz extremely low-frequency magnetic field exposure on proliferative activity in cancer cells: an in vitro study.","authors":"Chandra Kant Singh Tekam, Pooja Kumari, Ajay Kumar Sahi, Shravanya Gundu, Sanjeev Kumar Mahto","doi":"10.1093/rpd/ncaf099","DOIUrl":"10.1093/rpd/ncaf099","url":null,"abstract":"<p><p>In recent years, academia has sought the therapeutic applicability of periodic low-intensity electromagnetic field exposure (< 1 h/d) for biomedical applications. We have designed and developed a monoaxial Helmholtz coil chamber for non-invasive magnetic field exposure for therapeutic application, i.e. cancer therapy. In the current study, we observed 50 Hz extremely low-frequency pulsed electromagnetic field ELF-PEMF (1-3 mT) exposure effects on cell proliferation and morphology of cancer cell lines under in vitro conditions. We witnessed significant changes in cell proliferation and morphology of A549 cells for exposure durations of < 1 h/d. We also noticed a notable change in the actin cytoskeleton and shrinking of cell nuclei in A549 cells compared to the control groups. However, HepG2 and MCF-7 cells were notably unaffected by the current experimental conditions. The experimental evidence indicated that 50 Hz ELF-PEMF exposure of less than 1 h/d can significantly alter cell proliferation and induce morphological changes in A549 cells. This innovative, targeted, non-invasive method can be a popular therapeutic choice for patients with advanced stages of cancer. Moreover, exposure protocols will be much more helpful for clinicians depending on the patient's conditions, type of cancer cells, and exposure conditions, i.e. field intensities and duration.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1108-1124"},"PeriodicalIF":0.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144966473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing dose response of cancer incidence in Sweden after the Chernobyl Nuclear Power Plant accident with Life Span Study of atomic bomb survivors.","authors":"Martin Tondel, Tobias Nordquist, Mats Isaksson, Christopher Rääf, Robert Wålinder","doi":"10.1093/rpd/ncaf097","DOIUrl":"10.1093/rpd/ncaf097","url":null,"abstract":"<p><p>Follow-up of the atomic bomb survivors in Japan in the Life Span Study (LSS) has been fundamental for the understanding of the dose-response curve. We compare our risk estimates from a newly published epidemiological study on cancer in Sweden after the Chernobyl Nuclear Power Plant accident with the LSS data. Hazard ratios (HRs) with 95% confidence intervals (95% CIs) were calculated using conditional logistic regression adjusted for rural/nonrural habitat, education level, and pre-Chernobyl cancer incidence from 1980 to 1985, respectively. Adjusted HRs by sex were calculated in deciles for all cancer sites combined for 1986 to 2020. These risk estimates were translated to excess relative risk (ERR) to allow comparison with LSS incidence data. ERRs per decile were compatible with ERR in the low-dose range <100 mGy for both sexes. The CIs in each decile need to be taken into account when interpreting the dose-response curve. Risk estimates in dose categories add important information at very low doses on the dose-response curve when compared to LSS data.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1125-1130"},"PeriodicalIF":0.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12498092/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144966489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the relationship between noise reduction and object thickness in scatter correction processing.","authors":"Hiroki Tsuchiya, Takeshi Takaki, Satoru Ota, Yuki Fujita, Seiichi Murakami","doi":"10.1093/rpd/ncaf095","DOIUrl":"10.1093/rpd/ncaf095","url":null,"abstract":"<p><p>Physical grids (PGs) are used in portable bedside radiography to reduce scattered X-rays that reach the detector. Because the use of PGs degrades image quality due to oblique incidence of X-rays or deviation of the center line on the grid, scatter correction (SC) processing is often used instead of PGs. This study aimed to evaluate the relationship between object thickness and noise reduction in SC processing. Polymethyl methacrylate (PMMA) phantoms of different thicknesses (16, 20, 26, and 30 cm) were used as objects. The Burger phantom was placed at the center of the thickness direction of the PMMA phantoms. Images were acquired with PGs, without PGs, and with SC processing which consists of contrast improvement processing and noise reduction processing. Contrast and noise were evaluated. Contrast of images without PG improved when SC processing was used. However, the effect of noise reduction process decreased with increase in the thickness of PMMA, and significant decrease was observed when the thickness of PMMA was ≥26 cm. In SC processing, the effect of noise reduction decreased with the increase in object thickness. These findings suggest that the applicability of SC processing may be limited, particularly in large patients.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"1103-1107"},"PeriodicalIF":0.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144874831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Current preparedness and future directions of Korean cytogenetic biodosimetry laboratories for managing large-scale radiological incidents in South Korea.","authors":"Jong Yun Lee, Yang Hee Lee, Su San Yang, Ye Eun Lee, Eun-Hee Hong, In-Kyung Lee, Su Jung Oh, Soo Kyung Jeong, SengMin Back, Minsu Cho, Younghyun Lee","doi":"10.1093/rpd/ncaf113","DOIUrl":"https://doi.org/10.1093/rpd/ncaf113","url":null,"abstract":"<p><p>The current activities of the Korean Biological Dosimetry Network (K-BioDos) have focused on harmonizing the scoring of chromosomal aberrations. However, other biodosimetry procedures have not been sufficiently considered in preparation for large-scale radiological accidents. This study aimed to investigate the current status of various resources for performing cytogenetic biodosimetry on many samples and explore the limitations and future directions for analyzing large sample sizes. Although the capacity to score cytogenetic aberrations has improved, processing thousands of samples within a limited period remains a significant challenge. To further enhance biodosimetry performance, we recommend the establishment of automated systems for sample handling and increased government support to ensure adequate material resources. Additionally, we highlight the importance of developing strategies to assess occupationally exposed populations. These measures could enable K-BioDos and other national and international networks to establish comprehensive frameworks for dose assessment in large-scale radiological incidents.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145225842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectrometric analysis and internal dose assessment in lung counting for reactor-grade Pu compounds.","authors":"Masayuki Naito, Yuma Mihei, Kazuaki Yajima, Yuki Tamakuma, Eunjoo Kim, Kotaro Tani, Munehiko Kowatari, Osamu Kurihara","doi":"10.1093/rpd/ncaf114","DOIUrl":"https://doi.org/10.1093/rpd/ncaf114","url":null,"abstract":"<p><p>Internal contamination with plutonium (Pu) isotopes represents one critical exposure scenario in nuclear fuel cycle facilities. Lung counting is commonly employed as the initial individual monitoring method following inhalation of Pu. Due to the low detection sensitivity for characteristic X-rays emitted by Pu isotopes, the γ-ray emitted by coexisting 241Am is typically used as a surrogate for measurement. However, it is essential to establish clear procedures applicable in cases of severe internal exposure. In this study, key challenges associated with lung counting and dose assessment were examined, focusing on an inhalation event of reactor-grade Pu compounds containing 238Pu to 242Pu. These challenges included: complex spectral peak analysis; increased minimum detectable activity for Pu isotopes due to interference from 241Am; and evaluation of the minimum assessable dose considering Pu isotopic composition. Based on these considerations, procedures from lung counting to internal dose assessment were refined to support emergency response.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145200871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differential cardiovascular outcomes of radiotherapy in rectal, breast, and cervical cancer: insights from a SEER data analysis.","authors":"Zhengshuai Qiu, Xuejuan Yu, Tao Wang","doi":"10.1093/rpd/ncaf111","DOIUrl":"https://doi.org/10.1093/rpd/ncaf111","url":null,"abstract":"<p><p>Recent years have witnessed an increase in mortality and morbidity from chronic diseases unrelated to tumors in patients with malignant tumors. While radiation therapy reduces local tumor recurrence, it may elevate late mortality from cardiovascular diseases (CVD). The relationship between radiotherapy for cancer and CVD risk remains debated. This study analyzed the surveillance, epidemiology, and end results (SEER) Database from 1975 to 2014, focusing on long-term CVD observation periods of 1, 5, and 10 y. We tracked patients from cancer diagnosis to death or last follow-up, calculating hazard ratios (HRs) and 95% confidence intervals (CIs) for cardiovascular-specific survival (CVSS) using Fine-Gray binary competing risk regression analysis. Our analysis included 303 665 patients diagnosed with rectal (18 398), breast (276 263), and cervical (8004) cancers. Among these, 7098 (2.34%) died from CVDs. Rectal cancer patients undergoing radiotherapy, mainly in later stages, showed a reduced risk of CVD mortality (HR = 0.72, 95% CI: 0.61-0.84). Breast cancer patients treated with radiotherapy, who generally had smaller tumors, experienced significantly lower cardiovascular mortality (HR = 0.48, 95% CI: 0.46-0.51). Conversely, cervical cancer patients receiving radiotherapy had a higher rate of CVD mortality (HR = 2.14, 95% CI: 1.30-3.52). The AUC values for 3-y CVSS were 0.788, 0.837, and 0.821 for rectal, breast, and cervical cancers, respectively, indicating good predictive accuracy. The impact of tumor radiotherapy on CVD outcomes appears cancer-type specific, with cervical cancer radiotherapy increasing the risk of cardiovascular morbidity and mortality.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145186668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Establishment of diagnostic reference levels for quality control in panoramic radiography at public hospitals in Cyprus.","authors":"Vasileios I Metaxas, Georgiana Kokona, Stavros Savvakis, Antonis Evgeniou, Demetris Kaolis","doi":"10.1093/rpd/ncaf108","DOIUrl":"https://doi.org/10.1093/rpd/ncaf108","url":null,"abstract":"<p><p>Diagnostic reference levels (DRLs) help optimize panoramic radiography by balancing patient dose and image quality. Cyprus lacks national DRLs, highlighting the need to establish local DRLs (LDRLs) within State Health Services Organization (SHSO) hospitals as a part of quality assurance program. This study assessed imaging conditions for paediatric and adult patients undergoing panoramic radiography at SHSO hospitals to determine LDRLs. Patient data (age, sex), hospital location, exposure parameters, and dose area product (DAP) were extracted from the central PACS using the DOSE (Qaelum NV, Belgium) management system. Radiographs were acquired with four panoramic units at Nicosia General Hospital (NGH), Limassol General Hospital (LiGH), Larnaca General Hospital (LaGH), and Famagusta General Hospital (FGH). Third quartile DAP values were defined as LDRLs for paediatric (< 18 years) and adult (≥ 18 years) groups. DAP and exposure conditions were analysed based on hospital and sex groups. LDRLs were also compared with published reference values. The LDRLs were 116 mGycm2 for paediatric and 119 mGycm2 for adult patients. Mean DAP was significantly lower in paediatric patients (p < .001), although the decrease is relatively small (4%). Tube voltage was significantly higher in adults (p < .001). Significant inter-hospital differences in DAP and exposure parameters were observed (p < .001), with the highest doses recorded at LaGH due to elevated tube voltage and current. Adult males showed higher DAP than females (p < .05); in paediatric patients, significant sex-based differences were observed at NGH and in total dataset. SHSO DAP values were generally higher, except at LiGH and NGH that were comparable to or lower than those in the international literature. This study established LDRLs for panoramic radiography in Cyprus' public hospitals, filling a critical gap in national radiation protection data and supporting legal compliance. The LDRLs may serve as baseline for optimizing dental radiographic practices within the SHSO. Higher DAP compared to international data suggest a need for enhanced dose optimization, particularly in paediatric imaging. Significant inter-hospital differences in DAP and exposure parameters, despite standardized equipment and protocols, highlighting the need for further standardization and quality improvement.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145177881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}